•         在spring MVC下简单的验证码源码。


  •                 @Controller  // 注解问控制器

  •                 @RequestMapping("/login") // 访问路径

  •                 public class GetCodeController {

  •                 @RequestMapping("/getCode")

  •                 public void execute(HttpServletResponse response, 

  •             HttpSession session)throws Exception {

  •                                      BufferedImage p_w_picpath = new BufferedImage(100, 30,BufferedImage.TYPE_INT_RGB);


  •                 Graphics g = p_w_picpath.getGraphics();

  •                 Random r = new Random();             


  •                 g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));

  •               

  •                 g.fillRect(0, 0, 100, 30);

  •                 String number = getNumber(5);

  •                 session.setAttribute("scode", number);

  •                 g.setColor(new Color(0, 0, 0));

  •                 g.setFont(new Font(null, Font.BOLD, 24));

  •                 g.drawString(number, 5, 25);

  •               

  •                 for (int i = 0; i < 8; i++) {

  •                 g.setColor(new Color(r.nextInt(255), r.nextInt(255),

                r.nextInt(255), r.nextInt(255)));

                    g.drawLine(r.nextInt(100), r.nextInt(30), 

r.nextInt(100), r.nextInt(30));

                }                response.setContentType("p_w_picpath/jpeg");                 OutputStream ops = response.getOutputStream();                ImageIO.write(p_w_picpath, "jpeg", ops);                 ops.close();                }          

  •                 private String getNumber(int size) {

  •                 String str = 

        "ABCDEFGHIJKLMNOPQRSTUVWXYZqwertyuiopasdfghjklzxcvnm0123456789";

                String number = "";                Random r = new Random();                for (int i = 0; i < size; i++) {                number += str.charAt(r.nextInt(str.length())); }                return number;                }

        }


        

        验证码是我们在web开发中经常要用的的一个组件，特别是在请求分发中利用控制器

    来获取验证码，便于维护而且高大上。